chore: update docker image workflows

- Added support for multiple platforms (linux/amd64, linux/arm64) in docker-image-alpha.yml.
- Removed outdated docker-image-amd64.yml and docker-image-arm64.yml workflows.
- Deleted linux-release.yml, macos-release.yml, and windows-release.yml as part of workflow cleanup.

Author: Calcium-Ion

.github/workflows/docker-image-alpha.yml

@@ -53,6 +53,7 @@ jobs:
         uses: docker/build-push-action@v5
         with:
           context: .
+          platforms: linux/amd64,linux/arm64
           push: true
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}